It’s easier to import from the database and then just change the database query (from an importer that supports what you want to import).
Can you get a dump of the MVCForum database?
Oh. It looks like mssql. I don’t know if there are any importers available that use mssql, but I’m about to submit a PR for Telligent, which uses mssql. (I think I’ve written two, but that one was a custom forum).
If you want to hire someone to solve the problem, please see Redirecting….